JP3100713B2 - Extruded tube container mouth sealing material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing material for a mouth of an extruded tube container in which a filling material of a fluid to a semi-fluid is sealed, and is particularly excellent when a filling material containing a highly permeable substance is used. The present invention provides a mouth sealing material having an advantageous effect.

[0002]

2. Description of the Related Art An extruded tube container in which a filling material of a fluid to a semi-fluid is enclosed is formed by connecting a tubular container body having a closed lower end and an upper end of the tubular container body. The head comprises a frusto-conical shoulder portion and a continuous narrow neck and neck portion, and a cap removably engaged with the neck portion to enhance the sealing of the filling. For this reason, a sealing material is attached to the tip of the mouth and neck.

[0003] The mouth sealing material used in the extruded tube container usually has a barrier property against the filling in the tube container, easy peelability from the mouth of the tube container, and ease of handling as a sealing material. For the waist and the like, for example, from the front side to the back side,
A laminated sheet having a laminated structure of “synthetic resin film layer / metal foil / heat sealant resin layer for mouth and neck of tube container” is used. Lamination between the layers in the laminated sheet is usually performed by dry lamination using a urethane-based adhesive or the like.

[0004]

By the way, the above-mentioned mouth sealing material of the conventional tube container is formed by laminating the laminated members of the mouth sealing material by a so-called dry lamination method using a solvent type adhesive. It is a thing. For this purpose, for example, fragrance, mineral oil, machine oil, mint oil, edible oil, fat,
When filling materials containing highly permeable substances such as spices and organic polar solvents are stored in a tube container, the highly permeable materials in the filling material are heated by the heat forming the backside resin layer of the mouth sealing material. Penetrates the sealant resin layer and stays at the interface between the heat sealant resin layer and the metal foil. The highly permeable material that stays at this interface acts as an adhesive for the solvent-type adhesive between the heat sealant layer and the metal foil. And delamination occurs in this area. With this, when the consumer peels off the sealing material from the mouth and neck when using the filling material in the extruded tube container, the sealing material peels off at the interface between the heat sealant resin layer and the metal foil. Trouble occurs.

On the other hand, the present invention relates to a mouth sealing material adhered to the mouth and neck of a tube container even when the filling in the extruded tube container contains a highly permeable substance. The present invention provides a mouth sealing material free from delamination.

[0006]

Means for Solving the Problems The mouth sealing material of the extruded tube container of the present invention is arranged from the front side to the back side.
A first barrier layer comprising a thin metal layer, and 20.0 g
/ M ² · 24 hr (40 ° C., 90% RH) or less and 20.0 cc / m ² · 24 hr (1 atm, 2
A second barrier layer comprising a resin layer satisfying at least one of oxygen permeability of 0 ° C., dry) or less, and a sealant resin layer thermally bonded to the mouth and neck of the extruded tube container. It consists of a sheet,
Further, the above-mentioned problem is solved by using a laminated sheet to which no solvent type adhesive or anchor coating agent is applied between the second barrier layer and the sealant resin layer.

[0007] In the mouth sealing material of the extruded tube container of the present invention having the above-described structure, the first member comprising a metal thin film layer.
Aluminum, aluminum alloy,
A metal foil of about 5 to 100 μm made of copper, iron, or the like is used.

The second barrier layer is used to prevent the highly permeable substance in the tube container from reaching the metal thin film layer even if it penetrates the sealant resin layer. ^{/ m 2 · 24hr (40 ℃} , 90%
RH) not more than 20.0 cc / m ² · 24
The resin layer satisfies at least one of oxygen permeability not more than hr (1 atm, 20 ° C., dry). For the second barrier layer, a multi-layer co-extruded resin film is usually used, and mainly a saturated polyester resin, a nylon resin, an ethylene-vinyl alcohol copolymer resin, a propylene resin, a linear low-density polyethylene resin, a polyethylene resin, Thickness 10 to 100 combining medium density polyethylene resin, high density polyethylene resin, etc.
μ multi-layer co-extruded resin film, for example, “ethylene-vinyl alcohol copolymer / polypropylene”,
"Polypropylene / ethylene-vinyl alcohol copolymer / polypropylene", "Nylon / ethylene-vinyl alcohol copolymer / nylon / linear low density polyethylene", "linear low density polyethylene / nylon / linear low density polyethylene", etc. Are used such that the polyolefin resin layer side of these multilayer films faces the sealant resin layer side.

The sealant resin layer that is thermally bonded to the mouth of the tube container serves as the backside resin layer of the mouth sealing material.
The same resin as that used for the mouth and neck of the tube container, such as linear low-density polyethylene resin, high-density polyethylene resin, polypropylene resin, ethylene-vinyl alcohol copolymer resin, saturated polyester resin, When the mouth sealing material is of an easily peelable type, an ethylene-vinyl acetate copolymer resin mixed with an ethylene / α-olefin copolymer (for example, Tuffmer [trade name]), a polypropylene resin and a linear low-density polyethylene Formed to a thickness of about 10 to 60μ using a resin mixed with a resin, and a resin obtained by adding a tackifier (tackifier) to a polypropylene resin, an ethylene-vinyl acetate copolymer resin, a linear low-density polyethylene resin, etc. Is done.

[0010] When the mouth sealing material of the extruded tube container of the present invention is made of an easily peelable type, a metal is required to maintain the strength required at the time of peeling the sealing material. A first barrier layer composed of a thin film layer of 20.0 g / m ² · 24 hr (40 ° C., 90% R
H) The following water vapor permeability and 20.0 cc / m ² · 24 h
biaxial stretching having a thickness of about 10 to 30 μ between a second barrier layer made of a resin layer satisfying at least one of oxygen permeability of r (1 atm, 20 ° C, dry) or less. A support base made of a nylon film, a biaxially stretched polyester film, or the like is laminated.

Further, a heat-resistant resin layer such as a biaxially-stretched nylon film or a biaxially-stretched polyester film having a thickness of about 10 to 30 μm is laminated on the surface of the first barrier layer composed of a metal thin film layer. The mouth sealing material can have excellent properties in heat resistance and pinhole resistance. Furthermore, as a surface resin layer of the mouth sealing material, a heat-sealing resin layer which is heat-welded to the inner peripheral surface of the cap, for example, ethylene-vinyl acetate copolymer resin, chlorinated polypropylene resin, polyester By forming a resin layer of a base resin or the like, a so-called inner seal material for sealing the container mouth can be obtained.

[0012] In the mouth sealing material of the extruded tube container of the present invention, for example, a polyolefin resin extrusion lamination method or a urethane adhesive is used between the layers from the second barrier layer to the surface side. Adhesion may be performed by any of the dry lamination methods to be used. However, for bonding between the layers from the second barrier layer to the sealant resin layer forming the backside resin layer, a solvent-type adhesive (solvent-type anchor) is used. The application of coating agents) must be avoided. For this reason, an extrusion lamination method using a heat-welding resin is applied for bonding between the layers during this time. In addition, the adhesion between the second barrier layer and the sealant resin layer includes a thermoplastic resin similar to the polyolefin resin layer forming the back surface layer of the second barrier layer, such as polypropylene, linear low-density polyethylene, Thickness of 15 to 15 due to high density polyethylene, ethylene-vinyl acetate copolymer, ethylene-methacrylic acid copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methacrylate copolymer, ionomer, etc. It is preferable to use a melt-extruded resin layer of about 60 μm.

[0013]

The sealing material for the mouth of the tube container according to the present invention is 20.0 g / m ² ··· which forms the second barrier layer in the laminated sheet.
Water vapor permeability of 24 hr (40 ° C., 90% RH) or less and 20.0 cc / m ² · 24 hr (1 atm, 20 ° C., d
ry) A solvent-type adhesive (solvent-type anchor coat) between the resin layer satisfying at least one of the following oxygen permeability and the sealant resin layer forming the backside resin layer of the laminated sheet. Is not applied, even if the filling in the tube container contains a highly permeable material, the highly permeable material is removed by the presence of the second barrier layer. Does not permeate, and the interface of the laminated member constituting the sealing material does not peel off.

That is, even if the filling material containing a highly permeable substance is sealed in the tube container, the highly permeable substance is a solvent-type sealing material. Since it stays between the second barrier layer to which the adhesive is not applied and the back surface resin layer, a delamination phenomenon does not occur between the laminated members constituting the mouth sealing material. .

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The concrete constitution of the mouth sealing material of the tube container of the present invention will be described with reference to production examples.

Example 1 In FIG. 1, a urethane-based adhesive “A515 / A50: Takeda Pharmaceutical Co., Ltd.” was applied to the back surface of the first barrier layer 2 made of a soft aluminum foil having a thickness of 50 μm at 6 g / g. m ²
After applying the urethane-based adhesive, a thickness of 1
A support substrate 3 made of a 2μ biaxially stretched polyester film “E5200: Toyobo Co., Ltd.” is adhered, and subsequently, the support substrate 3 and “nylon / ethylene-vinyl alcohol copolymer / nylon / linear” Second barrier layer 4 made of coextruded laminated film "Gunze Co., Ltd .: PHL film" having a thickness of 45 .mu.
Was laminated with a urethane-based adhesive.

Next, a 30 μm-thick easily peelable film “VMX XB15” made of a mixed resin of an ethylene-vinyl acetate copolymer, polypropylene and polystyrene, and a surface of the linear low-density polyethylene resin layer of the second barrier layer 4.
FT: melt-extruding a sealant resin layer 5 composed of "Mitsubishi Yuka Co., Ltd." and a layer 6 of low-density polyethylene resin "M11P: Mitsui Petrochemical Industry Co., Ltd." To obtain a laminated sheet as a material for molding the mouth sealing material. Thereafter, the material for molding was punched and formed to obtain Example 1 of the mouth sealing material for the extruded tube container of the present invention.

The four-layer 45 μm thick “nylon / ethylene-vinyl alcohol copolymer / nylon / linear low-density polyethylene” forming the second barrier layer 4 used for the mouth sealing material 1 is used. The water vapor permeability of the extruded film is 10.0 g / m ² · 24 hr (40 ° C., 90%
RH), and the oxygen permeability is 4.0 cc / m ² · 24 h
r (1 atm, 20 ° C., dry).

Comparative Example 1 A first barrier layer 2 made of a soft aluminum foil with a thickness of 50 μm used in Example 1 and a support base made of a 12 μm-thick biaxially stretched polyester film “E5200: Toyobo Co., Ltd.” Material 3 and 30 μm-thick easily peelable film “V
MXXB15FT: Mitsubishi Yuka Co., Ltd. and a sealant resin layer 5 each comprising a 6 g / m ² urethane adhesive "A515 / A50: Takeda Pharmaceutical Co., Ltd." After obtaining a laminated sheet which is a molding material of the sealing material, by punching and molding the molding material,
A mouth sealing material for an extruded tube container for comparison was obtained.

[Experiment] Manufacture of a laminated sheet for forming a body of a tube container In FIG. 2, a corona discharge treatment of a supporting base material 12 made of a 12 μm thick biaxially stretched polyester film having one surface subjected to a corona discharge treatment. Is subjected to decorative processing 13 by printing, and then the biaxially stretched polyester film 1
A soft aluminum foil 15 having a thickness of 15 μ was laminated on the decorative surface 13 of No. 2 via an extruded resin layer 14 of an acid-modified polyolefin resin “N1108C: Mitsui Petrochemical Industry Co., Ltd.” having a thickness of 25 μ.

Next, a linear low density polyethylene A / nylon B /
Linear low-density polyethylene C three-layer thickness 5
An extruded film “BGL: Gunze Co., Ltd.” having a thickness of 3 μm was sandwiched between the film 16 and the soft aluminum foil 15.
A 0μ acid-modified polyolefin resin [N1108C: Mitsui Petrochemical Industry Co., Ltd.] is laminated via an extruded resin layer 17, and then a low-density polyethylene resin is extruded and laminated to form a 60μ thick backside resin layer. 18 was formed.

Thereafter, the urethane anchor coating agent (506X /
After roll-coating CAT10), a surface resin layer 19 is formed by extruding and laminating a low-density polyethylene resin layer having a thickness of 60 μm on the surface of the anchor coating agent. I got

Production of Extruded Tube Container The laminated sheet 11 for forming the body of the tube container is punched to obtain a blank plate for the body of the tube container.
By overlapping and thermally bonding the left and right side portions of the blank plate, the back resin layer in each of the blank plates has a diameter of 35 mm and a height of 150 mm as the inner circumferential surface layer of the container.
Was molded.

Next, the cylindrical body is attached to a mandrel for forming a tube container. In FIG. 3, one end of the cylindrical body 32 has a frustoconical shoulder portion 33 and a thin portion connected thereto. After molding the head 35 consisting of the neck and neck 34 by injection molding with high-density polyethylene resin,
Each of the mouth sealing materials 36 obtained in Example 1 and Comparative Example 1 was applied to the tip of the mouth and neck 34 by the respective mouth sealing materials 36.
Then, the sealant resin layer 5 and the mouth and neck 34 were brought into contact with each other and thermally bonded to obtain a tube container precursor indicated by reference numeral 31.

Next, 65% peppermint oil 5% is passed through the opening at the tail end of the cylindrical body 32 forming the body of the tube container precursor 31.
0 cc and the tail end was sealed by heat welding to obtain a tube container.

Preservation of Extruded Tube Container After the cap was engaged with the obtained tube container, it was stored in an inverted state at a temperature of 40 ° C. No abnormality occurred after the passage of days, but the mouth sealing material of Comparative Example 1 had 5
After storage for one day, a delamination phenomenon occurred between the support base material and the sealant resin layer.

[0027]

According to the present invention, the sealing material for the mouth of the extruded tube container of the present invention has an extremely excellent barrier performance due to the thin film layer of metal, and has a highly permeable filling material sealed in the tube container. Also, in the case where the delamination phenomenon does not occur between the laminated members of the mouth seal material and the seal material is peeled from the mouth portion when using the filling material in the tube container, the seal material is formed of the heat sealant layer and the metal. There is no trouble of peeling off at the interface with the foil.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing one example of a mouth sealing material of an extruded tube container of the present invention.

FIG. 2 is a cross-sectional model view showing an example of a laminated sheet for forming a trunk portion of an extruded tube container.

FIG. 3 is a cross-sectional view of a main part of a precursor of the extruded tube container, illustrating a mouth and neck portion of the extruded tube container and a mouth sealing member adhered to the mouth and neck portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing material of the mouth part of an extruded tube container 2 First barrier layer made of a soft aluminum foil 3 Support base material made of a biaxially stretched polyester film 4 Second barrier layer 5 Sealant resin layer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65D 53/04 B32D 15/08

Claims (1)

(57) [Claims] 1. A first barrier layer comprising a thin metal layer from a front side to a back side, and 20.0 g / m 2.
^{2 · 24hr (40 ℃, 90} % RH) or less of water vapor permeability and ^{20.0cc / m 2 · 24hr (1atm} , 20
A second barrier layer comprising a resin layer satisfying at least one of oxygen permeability of at most (° C, dry) or less;
A laminated sheet comprising a sealant resin layer thermally bonded to the mouth of the extruded tube container, wherein no solvent-type adhesive is applied between the second barrier layer and the sealant resin layer. A sealing material for the mouth of an extruded tube container.